If you have old furniture you want to replace in your home, don't think donating to charity is your only green option. Many local auction houses will come to your home, assess your furniture and sell it for you -- taking a small cut of the sale prices, of course. Auction houses aren't just for pricey masterpieces and antiques. Most companies will sell all sorts of things, ranging from furniture and decorative accessories to tableware and more. Check your local listings, and see if your old stuff is worth some cash.